.operate-btn {
    width: 80px;
    height: 80px;
    font-size: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 5px;
    position: relative;
    color: #5d5b5b;
}

.operate-btn button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.operate-btn .btn {
    font-size: 40px;
}